
//目录操作
/*
opendir
closedir
readdir
relldir
seekdir
*/
#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <stdlib.h>

void printdir(char *dir,int depth)
{
    DIR *dp;
    struct dirent *entry;
    struct stat statbuf;

    if((dp = opendir(dir)) == NULL) {
        fprintf(stderr,"cannot open directory: %s\n",dir);
        return;
    }

    chdir(dir);
    while((entry=readdir(dp))!=NULL)
    {
        lstat(entry->d_name,&statbuf);
        if(S_ISDIR(statbuf.st_mode))
        {
            if(strcmp(".",entry->d_name)==0||strcmp("..",entry->d_name)==0)
                continue;
            printf("%*s%s/\n",depth,"",entry->d_name);
            printdir(entry->d_name,depth+4);

        }
        else printf("%*s%s\n",depth,"",entry->d_name);
    }
    chdir("..");
    closedir(dp);
}

int main(int argc, char *argv[])
{
    char *topdir = ".";
    if(argc >= 2)
        topdir = argv[1];

    printf("Directory scan of %s:n",topdir);
    printdir(topdir,0);
    printf("done.\n");

    exit(0);
}

